The most common and most likely answer to this crossword clue is the 7 letter word VINTAGE
I've seen this crossword clue in The Daily Telegraph
V
I
N
T
A
G
E
More clues leading to the result VINTAGE
- Classic struggle to obtain books with silver
- Excellent plonk given at raves
- Old and new name in dispute
- Classic contest to acquire National Trust silver
- Old French wine with time to mature
- Collection of Graves? Poet finally given a bust
- Classic label retained by crime writer
- Very popular children’s game, English classic
- Name adopted by fruit producer of a pedigree
- Six books in a set sitting beside mature wine
Buddy explains!

The straight part
We know that "classic" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case classic = vintage.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does VINTAGE mean?
VINTAGE noun- The yield of grapes or wine from a vineyard or district during one season.
- Wine, especially high-quality, identified as to year and vineyard or district of origin.
- The harvesting of a grape crop and the initial pressing of juice for winemaking.
- The year or place in which something is produced.
- To harvest (grapes).
- To make (wine) from grapes.
- Of or relating to a vintage, or to wine identified by a specific vintage.
- Having an enduring appeal; high-quality.
- Classic (such as watches, video or computer games from the 1980s and early 1990s, old magazines, etc.).